How much of the Earth is covered by deserts?

According to blueplanetbiomes.org, the Earth is approximately one fifth (20 percent) desert. This includes hot deserts like the Sahara as well as cold deserts found in Arctic regions. Both types of...
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For an unmarried 25 year old is secondary insurance available to cover the 20 percent not covered by an employer's group policy?

What is the percent of hydrogen in water?

Water is made up of two parts hydrogen to one part oxygen, but the percentage of hydrogen by weight is 11.1 percent hydrogen to 88 percent oxygen because the hydrogen atoms are much lighter than th...
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